Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of the Heating Rate on the Microstructure and Fracture Toughness of Silicon Nitride Ceramics

소결시의 승온속도가 질화규소 요업체의 미세조직과 파괴인성에 미치는 영향

  • 이상훈 (한국화학연구소 무기소재부) ;
  • 이재도 (한국화학연구소 무기소재부) ;
  • 김도연 (서울대학교 무기재료공학과)
  • Published : 1995.11.01
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Abstract

Effect of heating rate on the microstructure of the silicon nitride ceramics has been investigated. The specimens with composition of 92Si3N4-6Y2O3-2Al2O3 (in wt%) were sintered at 176$0^{\circ}C$ under 127 kPa for 3h in N2 atmosphere at various heating rates from 1 to 10$0^{\circ}C$/min. The grain size of larger than 2${\mu}{\textrm}{m}$ and less than 1${\mu}{\textrm}{m}$ were measured and compared for the specimens. Regardless of heating rate, grain size of all the specimens showed bimodal distributions and the fracture toughness remained in the range of 5.53~5.72 MPa.m1/2. However, the aspect ratio of the grains of diameter above 2${\mu}{\textrm}{m}$ increased with the heating rate while their grain size and volume fraction decreased.

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References

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